I must disagree with you on dermaroller. I too used dermaroller before going to fraxel and the results are like night and day. Whereas I got no improvements with needling - 1.5mm also - I got much results with fraxel. If fraxel doesn't work for people, I highly doubt needling would. Needles are blunt objects compare to microns of laser beams. When they puncture your skin, they are not damaging as much scar tissues as beams of lights would. There is also a difference between mechanical damage and vaporizing scar tissues.
I highly doubt it based on my experience with dermaroller. That is nothing revolutinary in needles and mechanical punctures will never equal to the comprehensive coverage and damage lasers cause. If you didn't get much results from erbium, subcicion, you certainly wouldn't get it from needling. I've actually tried needling and fraxel - and the latter gave me a much better result.
I suggest you keep talking to as many dermatologist as possible and also ask them about dermarolling. I would try my next round of scar improvement based on what the majority suggest.
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